An online posting from a GOT7 fan, who claimed to have attended the group's signing event in Daegu this past October 12, spread to various online communities on October 27. The content of the post detailed the conversation between her and JB, who allegedly told her inappropriate, sexual jokes during the signing event. JB himself replied to the posting, adding fuel to the fire. 

The fan wrote that when she had told JB, "Because I traveled from a distant area, I slept at a motel yesterday," the idol had allegedly replied with a ribald joke that went, "Didn't you hear something good? Like a man and woman playing patty-cakes?" JB personally left a comment on the post, writing, "I think it's weirder that you know the meaning behind [what I said]. It's because I'm a healthy young man in his 20's." 

At JB's response, the fan wrote an additional post which claimed JB said more dirty things to her when she was getting a signature from Mark. She explained, "I had moved onto Mark to get his signature when JB joked at me again with 'Didn't you hear the sound of flesh?'" JB once again left a comment on this post, saying, "I don't know, it's something I just said...what is this?" JB's comment of "it's something I just said" was taken by the fans to mean that he admitted to the inappropriate remarks he spewed at the signing event. The idol was on the receiving end of much lambasting after this whole episode spread, with people rebuking him with criticisms the likes of, "I didn't see JB in that light. I'm disappointed," and, "His jokes were too much." 

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However, there is strong indication that the second post in question was simply fabricated. Some countered that the seating arrangement that the fan had mentioned (JB to Mark) was incorrect and that JB's "it's something I just said" was in reference to his previous comment, not the fan's second posting. In the end, the idol had received criticism for reasons he wasn't even aware of. When fans learned of the truth behind the fan's claims, many of them were relieved. They wrote, "It's good that the truth was exposed," "I don't understand the people that write stuff like this," "I didn't believe it from the start," and, "JB is not that kind of person."